Rokujou Reika

"Your existence belongs only to me. I won't give you to anyone!"

Seike Tadatsugu's ex-wife. She is also a good mother. Shortly after Yuu was born, she took her eldest son, Kai, and fled to her cheating partner. After that, she never visited, but recently she started contacting Tadatsugu and saying "I want to meet Yuu."

She doesn't like that Kuro is in the place where she should be, and utters abusive words that make her want to cover her ears.